git.txt: Fix doc formatting error

alejandro5042 · alejandro5042 · commit 399e3e504f2d · 2018-03-28T17:40:44.000-05:00
Fixing the header for Environment Variables &gt; System header added in
b2956b3.

Signed-off-by: Alejandro Barreto &lt;alejandro5042@gmail.com&gt;
diff --git a/Documentation/git.txt b/Documentation/git.txt
@@ -362,7 +362,7 @@ Environment Variables
 Various Git commands use the following environment variables:
 
 System
-~~~~~~~~~~~~~~~~~~
+~~~~~~
 `HOME`::
 	Specifies the path to the user's home directory. On Windows, if
 	unset, Git will set a process environment variable equal to:
